Stapling machine



March 26, 1940.

G. c. PASSEK STAPLING MACHINE Filed Feb. 9, 1939 i IIIIIIIA "III - Inventor: eo ye CPasselZ Patented Mar. 26, 1940 STAPLING MACHINE George C. Passek, Philadelphia, Pa., assignor to Alfred J. Paynter, Philadelphia, Pa.

- Application February 9, 1939, Serial No. 255,421

3 Claims.

This invention relates to improvements in stapling machines having the general characteriStics of the machine illustrated and described in H my Letters Patent No, 2,150,127, dated March '7, 1939, and including a guidefor a row of staples, a staple passage for receiving staples successively from the guide, a driver for driving the staples through and from the passage and into the work to'be stapled, and a member movable from a- 101 normal position by the engagement therewith of a staple driven through the passage by the'driver and being automatically returnable to its normalposition when released.

The object of the invention'is to provide a 151 novel and advantageous means or mechanism,

operated by the said member for preventing a staple from leaving said guide and entering the passage after the starting of a staple driving operation and before the completion of the driving 20 operation, for preventing staples from clogging or choking the staple passage and for ensuring the proper operation of the machine. 1

The invention resides in the elements and the combinations of them, as will be hereinafter 25 described and claimed.

Inthe accompanying drawing, illustrating the invention: 1

Figure 1 is a longitudinal section of my improvedmachine, on line 'l-l of Fig. 2. 30- Figure 2 is a vertical section through the forward part of the machine, on line 2-2 of Fig. l. a

Figure 3 is a view of a portion of Fig. 1, showing the positions of the parts at the completion 35 of a staple driving operation.

Figure'4 is a transverse section of the machine, on line 4-4 of'Fig. 1, enlarged.

Referring to the drawing, 3 designates the machine frame having a horizontally-extending 1. lower portion land a vertically-extending forward portion 6 rising from the forward end of the lower portion.

The lower portion 5 .of the frame is hollow and has afloor plate I. securedthereto and prolti. vided with a hollow,. longitudinally extending Staple guide 8 for receiving and guiding a row ,ofistaples. 9 I

,Slidable in the .forward end portion of the staple guide 8 is a staple supporting and forming i; member In having an inclined forward end sur face. The member ID has a rod l2 secured thereto and extending rearwardly therefrom through, and beyond a bracket l3 which is fixed within the stationary staple guide 8, and the g member l0 is urged forwardly by' a spring l4.

which encircles the rod l2 between the member ll and a loose collar lon'therod l2, the collar engaging the bracket I3.

The member in is movable rearwardly from its normal position, shown in Fig.1, to the posi- '5 tion shown in Fig. 3, againstthe action of the, spring M, and, after the member: has been moved to the position shown in Fig. 3, and released, the

spring 14 acts to automatically'i'nove'the member forwardly and to return it to its normal position. 105

After the springllhas moved the memberlil forwardly to its normal position, the further forwardmovement of the member isprevented by a gear rack I6 which is secured .to the rearward end portion of the rod l2, and whichis stopped by the bracket l3, as illustrated.

Therow of staples 9 is'fed forwardly by a suitable follower ll which emb'races-the staple guide 8 and is slidable thereon. The follower has a part is which extends upwardly through a longitudinal slot in the top'fwall of the lower portioniof the frame 3.-'The part I8 is connected tothe outer end portion of a spiral. spring l9 which surrounds'a shaft fixed in the frame 3, and has its inner end secured to the shaft. 5:

The spring 19 tends to wind itself around the shaft 20 and thereby urges the follower ll" and the row of staples 9 engaged thereby forwardly and presses the foremoststaple 2! of the row of staples against. the forward frame plate 22. i I

The foremost staple 2i embraces the forward end portion of the forming member ID and the staple occupies a position within a staple passage 23 having an open bottom and being formed between the forward end of the staple, guide 8 3 and the frame plate 22, andbetween side plates 24, 24 secured within the machine frame and constituting, in efiect, a part thereof.

Slidably mounted in the forward portion 6 of the frame 3 between the side plates 24, 24 thereof 40 and above and in the alinement with ,thefore most staple 2| is a staple driving plate 25 constructed and arranged to be moved downwardly" from its normal position shown in Fig. 1 and I through the. staple passage 23 to the position shown in Fig. 3 to drive the said foremost staple; downwardly through and discharge it from the open lower end of the passage. The staple driver 25 has a bracket 26 secured I thereto and pivotally connected .to the lower end *5 of a link 21 whose upper end is pivoted on a pin 28 carried by a lever arm 29 which-is fulcrumed on apin 30 in the forward portion 6 of the ma chine frame." The link 2'! and the fulcrumed end portion ofthe lever arm -29.-.are housed within 5 thereof engaged with a transverse pin 35 fixed in the machine frame The lever arm 29 is moved against the action of the springs 33, 33 when the arm is lowered to eifect a staple driving operation, and, thereafter, the springs act to elevate the arm to its normal position.

The opposing side walls of the staple passage 23 formed by the inner surfaces of the side plates 2d, 24 are curved and directed inwardly and provide staple leg deflecting parts 35, 35 at the sides of the delivery end of the staple passage 23. The curved surfaces of these deflecting parts 35, 35 extend below the plane of the bottom of the forming member ill and they are spaced from corners or obstructions 36, 36 formed by the member is) at the junctions of the bottom surface and side surfaces thereof.

The gear rack i6 which is moved rearwardly and forwardly by the forming member ID is in mesh with the lower portion of a pinion. 3'! which rotates freely on a shaft 38 carried by and extending between the side walls of the stationary staple guide 8. The upper portion of the pinion 31 is in meshv with a gear rack 39 secured'to the rearward end portions of two parallel rods or pins i0, 46 which are. slidably fitted within holes or openings formed by and between the top wall of the staple guide 8 andthe forming 'member iii. The gear racks lfiand 39 and the interposed pinion (H are constructed and arranged to cause the rods or pins 48, 40 to be projected forwardly from the normal position thereof, shown in Fig. l, to the position shown in Fig. 3, when the forming member Ill is moved rearwardlyfrom its normal position, shown in Fig. 1, to the position shown in Fig. 3, and to cause the rods or pins til, 40 to be withdrawn rearwardly from the position shown in Fig. 3 to the normal position shown in Fig. 1, when the forming member H3 is returned by the spring 44 to its normal position shown in 1, after being moved to the position shown in Fig. 3 and released.-

The staple driver has parallel, vertically extending slots 4i, ll therein through which the rods or pins 49, 4-13 move when they. are moved forwardly from the normal position shown in Fig. l, as and for a purpose hereinafter described.

The operation of the machine is as follows:

The machine is placed over the work to be stapled with the bottom surfaceof the machine in contact with the work and with, the staple passage 2i over the part of the work which is to receive the staple. i

The operating arm 29 is then depressed or forced downwardly against the action of the springs 33, 33, thereby forcing the staple driver 1 25 downwardly and causing it to engage thetop row 9 and drive the staple 2| of the crown of the foremost staple 21 of the downwardly through the passage'23 and discharge the staple .through the open lower end of the passage.

During the downward movement of the staple ii, the staple is guided by the walls of the passage 23. While the staple 2! is being driven Each of these springs-is-coiled around downwardly, the bottom of the crown thereof engages the inclined forward end surface ll of the forming member ID and thereby moves the 'memberlii rearwardly between the legs of the staple 2i and against the action of the spring [4 until the member It has been moved completely out of the path of thestaple crown, as the crown passes the lower end of .the inclined surface H; and, while the staple 2| is thus being driven downwardly, the lower ends of the legs of the staple encounter the curved surfaces of the deflecting parts 35, of the plates 24, 24 and are forced between such surfaces and the opposing corners 36, 36 of the forming member 10. As

the legs of the staple 2i are thus forced between the curved surfaces of the deflecting parts 35, 35 and the opposing corners 3t, 36, the pressure of the staple legs against the corners 36, 36 and against the plates 24, 24 at and above the curved surfaces of the deflecting parts 35, 35 thereof,

the staple legs are curved and directed inwardly, as shown in Fig. 2 by dot-and-dash lines, illustrating a staple driven part way through the passage 23, and such curving of the staple legs continues until the staple has been forced completely through the passage 23 and discharged from the open lower end thereof.

scribed, the downward pressure on the lever arm Zil is removed and the springs 33, 33 raise the lever arm and the staple driver 25 to the normal position; and, as the staple driver clears the forming member ID and the row of staples 9, the spring 14 moves the forming member forwardly to its normal position, and the spring l9 advances the follower l1 and row of staples 9, and moves the foremost staple of the row into the staple passage 23 beneath the driver 25 for a succeeding staple driving operation.

As the forming member H3 is moved rearwardly during each staple driving operation, the rods or pins :30, 4B are projected forwardly through the slots 4!, ll in the driver 25; and, while the pins are within the slots, the pins constitute obstructing elements which are adapted to be engaged by the bottom walls of the slots 4|, 4| to thereby prevent the raising of the driver 25 sufliciently to permit another staple to enter the staple passage 23. The staple driver 25 is prevented from being thus raised until after the staple being driven has been discharged from the staple passage 23, because the binding action of staple legs against the deflecting parts 35, 35 and corners 36, iii: of the forming member ID prevents the forward movement of the member Ill and consequently prevents the rearward movement of the pins Ml, All until the staple being driven has been driven far enough .to'clear the forming member ill and to be discharged from the staple passage 23, even though the driver 25 should be accidentally raised within the limits allowed by the slots 4!, 4i prior to the completionx'of a staple driving'operation. Thus it will be seen that after each'staple has been moved from the guide 8 into the passage 23 it will be impossible for the next succeeding staple to enter the passage 23 until the staple within .the passage has been discharged therefrom by the staple driver 25,. thereby effectively preventing "the staples obstructing means to limitreverse movement of the driver untilthe completion of a staple drivstructing' position;'in the path of a part of the driver, a block slidably mounted in the frame-and" urged to a positionto-be engaged and moved by a staple driven by the driver, and means operated .bysaid block to move said element to its obstructing position.

2. In a stapling machine, the combination of a frame havingstaple feedingand guiding means;

a staple driver operable to drive a staple through and discharge it fromsaid guiding means; and

obstructing means to limit reverse movement of the driver until the completion of a staple driving operation; said obstructing means compris-v ing an obstructing elementmovable into an obstructing position in the path of a part of the driver, a block slidably mounted in the frame 'a eaess the proper operation of the mawill cause the movement of obstructing position. v

operation.

and urged to'a position to be engaged and moved by a staple driven by the driver, a'gear rack movable by and with said element, a gear rackmov- Cable by and with'said block, and a pinion interposed between and in mesh with said racks,

whereby the'movement of said block by astaple said element to its 8. In a stapling; machine, the combinationaf a v frame having staple feeding and guiding means; ing operation; said obstructing means comprise ing an obstructing element movable into an oba staple driver operable to drive a staple through ing operation; said obstructing means comprising an obstructing element movable into an obstructing position in the path of the driver, a block movably mountedin the frame and urged to a position to be engaged and moved by a staple driven by the driver, and means operated by said block to move' said element to its obstructing position, said guiding means and said block have ing cooperating staple bending partscausing said block tobe frictionally held against reverse movement until the completion of the staple driving GEORGE C'QPASSEK. 

